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"""
Testing python specific API for FitObjective related classes.
"""
import unittest
import numpy as np
import bornagain as ba
from bornagain import deg
class SimulationBuilder:
def __init__(self):
self.m_ncalls = 0
self.m_pars = None
self.m_nrow = 3
self.m_ncol = 4
self.beam = ba.Beam(1., 1., 0)
self.detector = ba.SphericalDetector(self.m_ncol, -2*deg, 2*deg, self.m_nrow, 0., 3*deg)
def size(self):
return self.m_nrow * self.m_ncol
def build_simulation(self, pars):
self.m_ncalls += 1
self.m_pars = dict(pars)
material = ba.RefractiveMaterial("Shell", 0, 0)
sample = ba.Sample()
sample.addLayer(ba.Layer(material))
sample.addLayer(ba.Layer(material))
simulation = ba.ScatteringSimulation(self.beam, sample, self.detector)
return simulation
def create_data(self):
result = ba.Datafield(self.detector.clippedFrame())
result.setAllTo(1.)
return result
class FitObserver:
def __init__(self):
self.m_ncalls = 0
self.m_iterations = []
def update(self, fit_objective):
self.m_ncalls += 1
self.m_iterations.append(
fit_objective.iterationInfo().iterationCount())
class FitObjectiveAPITest(unittest.TestCase):
def test_SimulationBuilderCallback(self):
"""
Testing simulation construction using Python callback
"""
pars = ba.Parameters()
pars.add(ba.Parameter("par0", 0))
pars.add(ba.Parameter("par1", 1))
builder = SimulationBuilder()
data = builder.create_data()
# adding simulation callback and experimental data
objective = ba.FitObjective()
objective.addFitPair(builder.build_simulation, data, 1)
self.assertEqual(builder.m_ncalls, 0)
# running objective function
objective.evaluate(pars)
self.assertEqual(builder.m_ncalls, 1)
self.assertEqual(builder.m_pars["par0"], 0)
self.assertEqual(builder.m_pars["par1"], 1)
# checking arrays of experimental and simulated data
expected_sim = []
expected_data = []
for _ in range(0, builder.size()):
expected_sim.append(0)
expected_data.append(1)
self.assertEqual(expected_sim, list(objective.flatSimData()))
self.assertEqual(expected_data, list(objective.flatExpData()))
def test_FittingObserver(self):
"""
Testing simulation construction using Python callback
"""
pars = ba.Parameters()
pars.add(ba.Parameter("par0", 0))
pars.add(ba.Parameter("par1", 1))
# adding simulation callback and experimental data
builder = SimulationBuilder()
data = builder.create_data()
objective = ba.FitObjective()
objective.addFitPair(builder.build_simulation, data, 1)
# adding observer
observer = FitObserver()
objective.initPlot(5, observer.update)
# running objective function 11 times
for _ in range(0, 11):
objective.evaluate(pars)
self.assertEqual(observer.m_ncalls, 3)
self.assertEqual(observer.m_iterations, [1, 6, 11])
def test_IterationInfo(self):
"""
Testing map of parameters obtained from IterationInfo
"""
params = ba.Parameters()
params.add("bbb", 1)
params.add("aaa", 2)
info = ba.IterationInfo()
info.update(params, 3)
par_map = info.parameterMap()
expected_names = ["aaa", "bbb"]
expected_values = [2, 1.0]
names = []
values = []
for key in par_map:
names.append(key)
values.append(par_map[key])
self.assertEqual(names, expected_names)
self.assertEqual(values, expected_values)
self.assertEqual(info.iterationCount(), 1)
if __name__ == '__main__':
unittest.main()
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